Waimoku Falls in Haleakala Park in Maui is the focus of a popular four-mile round-trip hike past other smaller falls and through a bamboo forest. Visitors cross streams several times, but the path is well-maintained with walkways over the muddiest parts. The 400-foot-tall fall is surrounded by sheer cliffs, so this is a recommended hike and waterfall view for fit folks visiting the Hawaiian island.